The canvas is disappearing when a sketch is run

[anandology]

Describe the bug

The canvas next to the code editor on the sketch page is disappearing on run and it comes back after the execution is complete. For a second or two there is a blank in the place of canvas and this looks bad.

To Reproduce
Steps to reproduce the behavior:

1. Go to mon.school/sketches
2. Click on 'Create a new sketch'
3. Cick on Run
4. Notice the canvas disappearing

Expected behavior
The canvas should stat on the right and it should be cleared.

Screenshots